本文選題：銻　切入點：硫　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：碳材料與納米材料的復(fù)合是提高鋰離子和鈉離子電池電極材料電化學(xué)性能的主要方法。在本論文中,分別合成了碳復(fù)合銻(Sb)負(fù)極材料和碳復(fù)合硫(S)正極材料,并并研究了其中碳的引入對電池電化學(xué)性能的影響,本論文的主要主要創(chuàng)新點如下:1.發(fā)展了銻/碳(Sb/NPC)復(fù)合電極材料的制備方法。首先采用水熱法制備了一維的氨三乙酸鎳(Ni-NTA)配合物前體,再將其在Ar氣保護(hù)下,熱分解得到嵌有鎳(Ni)金屬顆粒的氮摻雜的一維碳復(fù)合材料,隨后通過納米限域的置換法,與SbCl3反應(yīng)生成負(fù)載Sb納米顆粒的一維N摻雜多孔結(jié)構(gòu)的銻碳復(fù)合物(記為Sb/NPC),其中金屬顆粒的尺寸約為10-20 nm。將此Sb/NPC復(fù)合材料作為負(fù)極材料時,在鋰離子電池中,在200 mA/g電流下,循環(huán)100圈后,可逆容量為556 mAh/g。在鈉離子電池中,100 mA/g電流下,循環(huán)100圈,容量為400.9 mAh/g。與之前文獻(xiàn)報導(dǎo)的類似材料相比,該復(fù)合材料的電化學(xué)性能得到提升。該材料性能的提升,主要是由于這種獨特的納米構(gòu)筑:氮摻雜,一維,多孔,納米化的銻顆粒,該材料具有良好的結(jié)構(gòu)穩(wěn)定性,可以有效的緩解Sb電極材料在鋰離子嵌入脫出的過程中的體積膨脹問題。2.發(fā)展了硫/碳(S/NPC-Cu)復(fù)合電極材料的制備方法。首先采用乙二胺四乙酸(EDTA),三聚氰胺為碳源和氮源,硝酸銅為金屬源,通過高溫?zé)峤獍l(fā)制備了均勻負(fù)載金屬銅(Cu)的氮摻雜的多孔碳納米片,再將其與單質(zhì)硫粉通過真空加熱復(fù)合,制備了硫/硫化銅/碳(記為S/NPC-Cu)和S/NPC碳納米復(fù)合材料,作為鋰硫電池的正極材料,在0.5C(1C = 1675 mAh/g)倍率下,循環(huán)200圈,容量分別為701 mAh/g和588 mAh/g,與純硫正極材料相比,復(fù)合材料電極的電池循環(huán)性能得到很大提升。電池性能的提升應(yīng)當(dāng)歸因于:1.氮摻雜提高了材料的導(dǎo)電率及與多硫化物的吸附作用,2.金屬硫化物進(jìn)一步提供了較多的活性位點供多硫化物吸附。
[Abstract]:The composite of carbon materials and nano-materials is the main method to improve the electrochemical performance of electrode materials for lithium ion and sodium ion batteries. In this paper, carbon composite antimony ion (SB) negative electrode materials and carbon compound sulfur ion (S) cathode materials are synthesized, respectively. The influence of carbon on the electrochemical performance of the battery was also studied. The main innovations of this thesis are as follows: 1. The preparation method of SB / C Sb / NPC composite electrode material has been developed. Firstly, the precursor of 1-D Ni-NTA-aminotriacetate complex was prepared by hydrothermal method, and then the precursor was prepared under the protection of ar gas. A nitrogen-doped one-dimensional carbon composite containing Ni (Ni) particles was obtained by thermal decomposition. One-dimensional N-doped antimony carbon composites supported on SB nanoparticles were formed by reacting with SbCl3 (referred to as SB / NPCs, where the size of the metal particles is about 10-20 nm). When the Sb/NPC composite is used as a negative electrode material, in the lithium ion battery, at 200 mA/g current, After the 100th cycle, the reversible capacity is 556mAh/ g. At 100 mA/g current in the sodium ion battery, the capacity is 400.9 mAh/ g. The electrochemical properties of the composite are improved compared with the similar materials reported in previous literatures. Mainly due to this unique nanomaterials: nitrogen-doped, one-dimensional, porous, nanocrystalline antimony particles, the material has good structural stability, It can effectively alleviate the volume expansion of SB electrode materials in the process of lithium ion intercalation. 2. The preparation method of S / C Si / NPC-Cu) composite electrode materials has been developed. Firstly, EDTAA was used as ethylenediamine tetraacetate and melamine as carbon and nitrogen source. Copper nitrate as a metal source, N-doped porous carbon nanochips were prepared by pyrolysis at high temperature, and then combined with elemental sulfur powder by vacuum heating. Sulfur / copper sulphide / carbon (S / NPC-Cu) and S/NPC carbon nanocomposites were prepared, which were used as cathode materials for lithium-sulfur batteries at a 0.5C(1C = 1675 mAh/ g ratio, with a cycle capacity of 701 mAh/g and 588mAhP / g, respectively, compared with pure sulfur cathode materials. The battery cycle performance of composite electrode has been greatly improved. The improvement of battery performance should be attributed to: 1. Nitrogen doping improves the conductivity of the material and its adsorption with polysulfide. 2. Metal sulfides provide more. The active sites are used for polysulfide adsorption.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O646;TB33

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 Thang Ngoc Cong;;Progress in electrical energy storage system:A critical review[J];Progress in Natural Science;2009年03期

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本文編號：1652758